Hand tool for compressing valve springs and for analogous purposes



April 30, 1929- H. "r. GIRDLESTONE ET AL 1,710,797

HAND TOOL FOR CQKPRESSING VALVE SPRINGS AND FOR ANALOGOUS PURPOSES Filedlarch 29. 1926 M Herbert 77mm 'drdlzstom,

Patented Apr. 30, 1929.

UNITED STATES PATENT OFFICE.

HERBERT THOMAS GIRDLESTONE AND J'AMEB REST, OF LONDON, ENGLAND.

HAND TOOL FOR COMPRESSING VALVE SPRINGS AND FOR ANALOGOUS PURPOSES.

Application filed March 29, 1926, Serial No. 98,125, and in GreatBritain January 20, 1996.

This invention relates to hand tools of the prising, compressing orcramp type, and has for its object to provide a tool of simple andcompact, but nevertheless efficient, construction.

A tool embodying the invention comprises a frame, a member movablysupported by the frame and adapted to engage and disengage or grip andrelease the article to be operated upon, and mechanism for actuating themovable member and looking it in the operative position, such mechanismbeing operable from a point distant from the article in connection withwhich the tool is destined to be used.

\Ve will now describe, by way 0t example and with reference to theaccompanying drawings, one form of tool, constructed in accordance withthe invention, specially applicable for compressing thesprings of thevalves of internal combustion engines in situ.

Of the aforesaid drawings:

Fig. 1 .is a side elevation representing the tool in the operativeposition relatively to a valve indicated in dot-and-dash lines, theright-hand and left-hand sides being, for distinction, designated thefront and the rear respectively;

Fig. 2 is a corresponding front elevation of the tool;

Fig. 3 is a rear elevation thereof; and

Fig. 4 is a sectional plan of the tool, the

section being taken on the line 4-4 in P Fig. 1.

According to this example, to constitute the aforesaid frame, weconstruct a member a with a rectangular cavity 5 formed by the front andrear sides 0 and d and the ends 6 and f. To the bottom of the frame a,and at the rear side thereof, we fix a member 9 to constitute a foot orabutment in the use of the tool. This foot or abutment g may be of a jawor any desired structure, the former being illustrated at h; and, as isalso illustrated, it may have a depending retaining or guiding flange iat its outer edge. The frame rear side J, from this member 9' to thetop, is cut away or left open in the making, centrally and vertically,to provide a slot 9'. Towards the bottom of the frame a, and in thevicinit of the foot or abutment the ends 6 an Z are cut away to furnishopenings or slots and Z; as shown, the slot Z is shorter than the slotis for the purpose that will be explained presently. The

front side 0 is formed with an opening m, and, although not shown, therear side (l may be formed with a coincident opening or simply a recess.

A member 0 is reciprocably associated with the frame a to constitute thebeforementioned movable member. This member 0 comprises a head 10, abody q, anda neck 1* connecting the two. The head p is shaped to conformwith the cavity b of the frame a, and the neck 7' with the slot in therear side (I thereof, while the body q is of a horse shoe structure witha marginal upright ledge s. The member 0 is assembled with the frame awith the head p reposing in the carity I) and the neck 7* in the slot j,hence the body 9 projects from the rear 0! of the frame a.

The aforesaid actuating and locking mechanism comprising a spindle t ofany appropriate lengthsuch as to present unimpeded distant operation.The spindle t, near-the rear end, provided with a heart-shapedlike cam ufor coactingwith the lower end of the head p of the movable member 0.The cam u is formed with a hump o for in teracting with the slots is andZ in the ends 6 and f of the frame a as hereafter described, the lengthsof the slots is and l relae tively to the circumferential length of thecam it being such that the shorter slot 7 functions to impedimentallycontact at the top and bottom with the cam u in itstravel' in the upwarddirection, while the longer slot is permits of unrestricted travel inthe opposite direction. The distant or front end of the spindle t isfitted with a tummy-bar w. This mechanism 1) andu is assembled with theframe w and the movable member 0 with the cam u locatcdin the framecavity 6 below the head p of the movable member 0 and in alignment withthe slots in and l in the frame ends e and f, the spindle t passingthrough the opening m in the front a of the frame a: in which opening ma 'ournal n tits, and its extreme end being tig ted fitted in the cam21. and riveted over the rearside thereof. Thus the spindle t isrotatably mounted in the frame a. When an opening or recess is providedin the rear side 02 complemental to the openin m, the extreme end of thespindle t is passed through the cam u and journalled therein, the cambeing suitably securedto the spindle t.

Briefi the mode of use and operation of the too -assuming means of anyapprot priate kind have been applied, if required, to the valve to holdit stationary arc as follows:

The tool is suitably positioned, that is, for instance, with the framea, through the agency of its foot or abutment g, standing upon orco-acting with an appropriate support, such as the crank case, thecylinder base, or, as exemplified, with its jaw 71, and flange 15embracing the tappet end or nut a", and with the movable member 0 inengagement with thecollar y, or it may be the pin on the valve stem 2,the bifurcated structure of the head p of the member 0 admitting ofready assembly and disassembly and the upright ledge s assuringengagement. Then the shaft t is turned by the tommy-bar w whereupon,through the agency of the cam a, the movable member 0 is lifted with astraightline motion whereby the valve spring compressed, this conditionbeing maintained or locked by the interengagement of the hump r of thecam '20 with the slot if in the end 7 of the frame (IL and therebyadmitting of the manipulation. of the requisite valve components, thehump e of the cam 10 projecting through the slot Z and contactually andlimitarily hearing at the top and bottom upon the correspoml ing ends ofthe slot Z. The movable or reciprocable member 0 may be restored by handto its operative position relatively to the cam. 11- which is returnedto its initial position. by turning the spindle t, the slot 71: givingthe requisite clearance.

It will be evident from the foregoing that the am device a may besubstituted by mechanical equivalents, such as a rack and pinion; andthat the structural detai of the too]. may be variously modified withoutdeparting from the essential features com- 1 g a reciprocable engagingand disengaging or gripping and releasing member 0 actuatablc by adistantly-operable spindle 6 through interposed interengaging elements,and a frame or support (Z for the member 0, the spindle t and the alliedparts.

What we claim and desire to secure by Letters Patent is:

1. A hand tool of the type described comprising, in combination, a frameconsisting of a member having a rectangular cavity formed by the sidesand the ends and having at the bottom of the rear side a memberconstituting a foot or abutment in the use of the tool, said rear sidehaving a slot running centrally and vertically from said foot orabutment to the top, and said ends having slots; a member movablysupported by said frame and composed of a head, a body and a neck, saidhead and neck, respectively, conforming to said frame-cavity and saidrear-side frame-slot, and on assembly rcposing therein with said bodyprojecting from the roar of said frame; an actuating and lockingmechanism including a spindle journalled in said frame, a. cam providedon' said spindle and. located in said cavity below said head of saidmovable n'iember and in alignment with said slots in said frame ends.

2. A hand tool of the type described con1- prising, in combination, aframe consisting of a n'ien'ibcr having a rectangular cavity forn'ied bythe sides and the ends and having at the bottom rear side a memberconstb toting a foot or abutment of jzuv-strurture, said ir side havinga slot running centrnlly and vertically from i-iaid foot or abut ment tothe top, and said ends having open ingg s or slots of unequal lengtlua;a member rrriprocably 1-u1morled by said frame and composed of a head, abody and a neck, said head 0 'ul nee a respectively C(Hl'llllllllil}: loid cavity in said frame and said slot in its said rear side and onassembly rl-posing therein with said body projecting from the rear ofsaid frame, said projecting body being of a lun'sc-shoe-lihc structurewith a marginal upright ledge; and actuating and locking mcclmnism forsaid reciprocablr lnen'lber, said llllft'lltlllf-lll includii a spindlejmirnalled in said mrmbcr, a cam provided on said spindle located insaid frame-earltv below said head of said riuriprouiblc member and inalignment with said slols in said frame ends, said cam co opcraling withthe shorter of said slots to lock the parts in the operative position.

In testimony whereof, we allix our sin} natures.

l-lEilBiillT THOMAS GlIlDLESTONE.

JAMES REST.

